We were informed recently of an XSS exploit in Zen Cart code.

I would like to thank Armorize technologies for responding so quickly to clarify the details of the exploit, especially Wayne Huang and Benson Wu of Armorize Technologies,

You can read more about the exploit and how to patch the files that are vulnerable at

http://www.zen-cart.com/forum/showthread.php?p=270700#post270700

**Zen Cart v1.3.5 XSS PATCH Released Oct 1, 2006

To combat a reported XSS exploit vulnerability in Zen Cart, simply download the files from the patch ZIP and copy the enclosed /admin files for login.php and password_forgotten.php to your admin folder.

Remember, if you have renamed your admin folder, you will have to use that
folder name when copying/uploading.**

File can be downloaded here:
http://sourceforge.net/project/showfiles.php?group_id=83781&package_id=171544&release_id=444622

These fixes are NOT included in the main "full-fileset" zip.
Please apply these fixes AFTER unzipping the main full-fileset zip contents.

Alternatively, you may wish to apply the edits manually:
http://www.zen-cart.com/forum/showthread.php?t=47526